| A | B |
|---|
| Ablution, Abluere | rinsing of the mouth, eucharistic vessels and fingers after touching the sacred host |
| Absolution | sacramental remission of sin |
| Acclamation | peoples response, in liturgical worship |
| Acolyte | altar-server at the Mass (altar attendant) |
| Agnus Dei | Lamb of God |
| Alb, Tunica alba | White undergarment of linen, reaching to the feet |
| Alleluia | Praise ye God |
| Altar, altaria | an elevated place or structure on which sacrifices are offered or at which religious rites are performed |
| Ambo | A raised place between the sanctuary and the nave for reading lessons/sermons. |
| Amen | So be it, let it happen |
| Amice | shoulder-cloth; rectangular linen cloth with straps (30"x20") worn under the alb. |
| Apse, apsis | semicircle end of the presbytery |
| Archbishop | the head of the archdiocese |
| Archdiocese | a geographical grouping of one or more diocese under the jurisdiction of an archbishop |
| Asperges | Holy water |
| Bishop | the head of a territorial unit of the church |
| Bow | an inclination of the body made while standing during Liturgical prayer |
| Brandeun | a cloth that has been laid upon the grave of a saint, and then used as a substitute for a relic |
| Breaking of bread | the fractioning of the altar-breads before the communion. |
| Brother | in the Roman Catholic faith, a man wh ois a member of a relgious order without being ordained or while preparing for ordination |
